package com.foreknow.demo10;

public class Test2 {
    private int a;
    int b;
    protected int c;
    public int d;




    public void haha() {
        this.a=1;
        this.b=2;
        this.c=3;
        this.d=4;
        //在同一个类中都可以访问
    }

}
